diff --git a/.drone.yml b/.drone.yml
index 08029de..78fd3c6 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -1,30 +1,50 @@
-# ---
-# kind: pipeline
-# name: deploy to swarm-test.autonomic.zone
-# steps:
-#   - name: deployment
-#     image: git.coopcloud.tech/coop-cloud/stack-ssh-deploy:latest
-#     settings:
-#       host: swarm-test.autonomic.zone
-#       stack: wordpress
-#       generate_secrets: true
-#       purge: true
-#       deploy_key:
-#         from_secret: drone_ssh_swarm_test
-#       networks:
-#         - proxy
-#     environment:
-#       DOMAIN: wordpress.swarm-test.autonomic.zone
-#       STACK_NAME: wordpress
-#       LETS_ENCRYPT_ENV: production
-#       SECRET_DB_PASSWORD_VERSION: v1
-#       SECRET_DB_ROOT_PASSWORD_VERSION: v1
-#       PHP_UPLOADS_CONF_VERSION: v1
-#       ENTRYPOINT_CONF_VERSION: v1
-#       HTACCESS_CONF_VERSION: v1
-# trigger:
-#   branch:
-#     - main
+---
+kind: pipeline
+name: test
+
+steps:
+  - name: test
+    image: alpine:3.21
+    environment:
+      SHELLCHECK_OPTS: -s bash
+    commands:
+      - apk add --no-cache bash shellcheck py3-yaml curl
+      - curl -sSLo /usr/local/bin/gomplate https://github.com/hairyhenderson/gomplate/releases/download/v5.0.0/gomplate_linux-amd64
+      - chmod +x /usr/local/bin/gomplate
+      - tests/run.sh
+
+  # deployment step disabled: swarm-test.autonomic.zone is down
+  # - name: deployment
+  #   image: git.coopcloud.tech/coop-cloud/stack-ssh-deploy:latest
+  #   when:
+  #     event:
+  #       - push
+  #     branch:
+  #       - main
+  #   settings:
+  #     host: swarm-test.autonomic.zone
+  #     stack: wordpress
+  #     generate_secrets: true
+  #     purge: true
+  #     deploy_key:
+  #       from_secret: drone_ssh_swarm_test
+  #     networks:
+  #       - proxy
+  #   environment:
+  #     DOMAIN: wordpress.swarm-test.autonomic.zone
+  #     STACK_NAME: wordpress
+  #     LETS_ENCRYPT_ENV: production
+  #     SECRET_DB_PASSWORD_VERSION: v1
+  #     SECRET_DB_ROOT_PASSWORD_VERSION: v1
+  #     PHP_UPLOADS_CONF_VERSION: v1
+  #     ENTRYPOINT_CONF_VERSION: v1
+  #     HTACCESS_CONF_VERSION: v1
+trigger:
+  event:
+    - push
+    - pull_request
+  branch:
+    - main
 ---
 kind: pipeline
 name: generate recipe catalogue
diff --git a/README.md b/README.md
index 99435e2..497c39c 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,23 @@ Below are the instructions for the local relay.
    `$DOMAIN` or in its `$EXTRA_SENDER_DOMAINS`
 3. `abra app deploy <app-name>`
 
+## Tests
+
+Run the full test suite:
+
+```sh
+bash tests/run.sh
+```
+
+### Prerequisites
+
+The test suite uses several tools. Install them with your equivalent of:
+
+```sh
+brew install shellcheck gomplate
+```
+Some tests skip gracefully if their dependencies are missing.
+
 [abra]: https://git.autonomic.zone/autonomic-cooperative/abra
 
 ## Migrate from a non-Co-op Cloud Wordpress install
diff --git a/compose.ftp-2220.yml b/compose.ftp-2220.yml
index 9ac54c2..cc544b5 100644
--- a/compose.ftp-2220.yml
+++ b/compose.ftp-2220.yml
@@ -4,4 +4,4 @@ version: "3.8"
 services:
   ftp:
     ports:
-        - 2220:22
+      - 2220:22
diff --git a/compose.ftp-2221.yml b/compose.ftp-2221.yml
index 897b2b9..b65487e 100644
--- a/compose.ftp-2221.yml
+++ b/compose.ftp-2221.yml
@@ -4,4 +4,4 @@ version: "3.8"
 services:
   ftp:
     ports:
-        - 2221:22
+      - 2221:22
diff --git a/compose.ftp-2222.yml b/compose.ftp-2222.yml
index 38ee4b2..246c671 100644
--- a/compose.ftp-2222.yml
+++ b/compose.ftp-2222.yml
@@ -4,4 +4,4 @@ version: "3.8"
 services:
   ftp:
     ports:
-        - 2222:22
+      - 2222:22
diff --git a/compose.ftp-2223.yml b/compose.ftp-2223.yml
index 467aeb0..f26339d 100644
--- a/compose.ftp-2223.yml
+++ b/compose.ftp-2223.yml
@@ -4,4 +4,4 @@ version: "3.8"
 services:
   ftp:
     ports:
-        - 2223:22
+      - 2223:22
diff --git a/compose.ftp-2224.yml b/compose.ftp-2224.yml
index 5d0a7ba..1626682 100644
--- a/compose.ftp-2224.yml
+++ b/compose.ftp-2224.yml
@@ -4,4 +4,4 @@ version: "3.8"
 services:
   ftp:
     ports:
-        - 2224:22
+      - 2224:22
diff --git a/compose.ftp-2225.yml b/compose.ftp-2225.yml
index 9ac54c2..cc544b5 100644
--- a/compose.ftp-2225.yml
+++ b/compose.ftp-2225.yml
@@ -4,4 +4,4 @@ version: "3.8"
 services:
   ftp:
     ports:
-        - 2220:22
+      - 2220:22
diff --git a/compose.matrix.yml b/compose.matrix.yml
index 3154218..78c7b79 100644
--- a/compose.matrix.yml
+++ b/compose.matrix.yml
@@ -7,4 +7,4 @@ services:
       labels:
         - "traefik.http.routers.${STACK_NAME}.middlewares=${STACK_NAME}-redirect-matrix-well-known"
         - "traefik.http.middlewares.${STACK_NAME}-redirect-matrix-well-known.redirectregex.regex=^https://(.*)/.well-known/matrix/(.*)"
-        - "traefik.http.middlewares.${STACK_NAME}-redirect-matrix-well-known.redirectregex.replacement=https://${MATRIX_DOMAIN}/.well-known/matrix/$$2"
\ No newline at end of file
+        - "traefik.http.middlewares.${STACK_NAME}-redirect-matrix-well-known.redirectregex.replacement=https://${MATRIX_DOMAIN}/.well-known/matrix/$$2"
diff --git a/entrypoint.sh.tmpl b/entrypoint.sh.tmpl
index 6548983..ad7eb73 100644
--- a/entrypoint.sh.tmpl
+++ b/entrypoint.sh.tmpl
@@ -1,13 +1,13 @@
 #!/bin/bash
 
-{{ if (env "PHP_EXTENSIONS") }}
-docker-php-ext-install {{ env "PHP_EXTENSIONS" }}
+{{ if (getenv "PHP_EXTENSIONS") }}
+docker-php-ext-install {{ getenv "PHP_EXTENSIONS" }}
 {{ end }}
 
 curl -z /usr/local/bin/wp -o /usr/local/bin/wp https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
 chmod +x /usr/local/bin/wp
 
-{{ if eq (env "ENABLE_COMPOSER") "1" }}
+{{ if eq (getenv "ENABLE_COMPOSER") "1" }}
 mkdir -p /var/www/.composer
 chown www-data:www-data /var/www/.composer /var/www/html/composer
 
@@ -19,18 +19,18 @@ rm /tmp/composer-setup.php
 mv /var/www/html/composer.phar /usr/local/bin/composer
 {{ end }}
 
-{{ if eq (env "CORS_ALLOW_ALL") "1" }}
+{{ if eq (getenv "CORS_ALLOW_ALL") "1" }}
 a2enmod headers
 sed -ri -e 's/^([ \t]*)(<\/VirtualHost>)/\1\tHeader set Access-Control-Allow-Origin "*"\n\1\2/g' /etc/apache2/sites-available/*.conf
 {{ end }}
 
-{{ if eq (env "MULTISITE") "enable" }}
+{{ if eq (getenv "MULTISITE") "enable" }}
 export WORDPRESS_CONFIG_EXTRA="$WORDPRESS_CONFIG_EXTRA
 define('WP_CACHE', false);
 define('WP_ALLOW_MULTISITE', true );"
 {{ end }}
 
-{{ if or (eq (env "MULTISITE") "subdomain") (eq (env "MULTISITE") "subfolder") }}
+{{ if or (eq (getenv "MULTISITE") "subdomain") (eq (getenv "MULTISITE") "subfolder") }}
 export WORDPRESS_CONFIG_EXTRA="$WORDPRESS_CONFIG_EXTRA
 define('MULTISITE', true);
 define('SUBDOMAIN_INSTALL', true);
@@ -56,7 +56,7 @@ fi
 
 chown -R --from=root:root www-data:www-data /var/www/html/wp-content/
 
-if [ -n "$@" ]; then
+if [ $# -gt 0 ]; then
 	"$@"
 fi
 
diff --git a/htaccess.tmpl b/htaccess.tmpl
index a71a625..376a8a7 100644
--- a/htaccess.tmpl
+++ b/htaccess.tmpl
@@ -3,7 +3,7 @@
     Require all denied
 </FilesMatch>
 
-{{ if eq (env "MULTISITE") "" -}}
+{{ if eq (getenv "MULTISITE") "" -}}
 # BEGIN WordPress
 
 RewriteEngine On
@@ -17,7 +17,7 @@ RewriteRule . /index.php [L]
 # END WordPress
 {{- end -}}
 
-{{- if eq (env "MULTISITE") "subfolder" -}}
+{{- if eq (getenv "MULTISITE") "subfolder" -}}
 # BEGIN WordPress Multisite
 # Using subfolder network type: https://wordpress.org/documentation/article/htaccess/#multisite
 
@@ -39,7 +39,7 @@ RewriteRule . index.php [L]
 # END WordPress Multisite
 {{- end -}}
 
-{{- if eq (env "MULTISITE") "subdomain" -}}
+{{- if eq (getenv "MULTISITE") "subdomain" -}}
 # BEGIN WordPress Multisite
 # Using subdomain network type: https://wordpress.org/documentation/article/htaccess/#multisite
 
diff --git a/msmtp.conf.tmpl b/msmtp.conf.tmpl
index aad889b..7a94c13 100644
--- a/msmtp.conf.tmpl
+++ b/msmtp.conf.tmpl
@@ -1,19 +1,19 @@
 account default
-host {{ env "SMTP_HOST" }}
-from {{ env "MAIL_FROM" }}
-user {{ or (env "SMTP_USER") (env "MAIL_FROM") }}
-port {{ env "SMTP_PORT" }}
+host {{ getenv "SMTP_HOST" }}
+from {{ getenv "MAIL_FROM" }}
+user {{ or (getenv "SMTP_USER") (getenv "MAIL_FROM") }}
+port {{ getenv "SMTP_PORT" }}
 
-{{ if eq (env "SMTP_OVERRIDE_FROM") "on" }}
+{{ if eq (getenv "SMTP_OVERRIDE_FROM") "on" }}
 set_from_header on
 {{ end }}
 
-{{ if eq (env "SMTP_AUTH") "on" }}
-auth {{ env "SMTP_AUTH" }}
+{{ if eq (getenv "SMTP_AUTH") "on" }}
+auth {{ getenv "SMTP_AUTH" }}
 passwordeval "cat /run/secrets/smtp_password"
 {{ end }}
 
-{{ if eq (env "SMTP_TLS") "on" }}
-tls {{ env "SMTP_TLS" }}
+{{ if eq (getenv "SMTP_TLS") "on" }}
+tls {{ getenv "SMTP_TLS" }}
 tls_trust_file /etc/ssl/certs/ca-certificates.crt
 {{ end }}
diff --git a/renovate.json b/renovate.json
index 5db72dd..347c815 100644
--- a/renovate.json
+++ b/renovate.json
@@ -2,5 +2,36 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended"
+  ],
+  "regexManagers": [
+    {
+      "fileMatch": ["(^|/)compose[^/]*\\.yml$"],
+      "matchStrings": [
+        "image:\\s*\"wordpress:(?<currentValue>[^\"]+)\"",
+        "image:\\s*\"mariadb:(?<currentValue>[^\"]+)\""
+      ],
+      "datasourceTemplate": "docker",
+      "lookupNameTemplate": "{{{packageName}}}"
+    },
+    {
+      "fileMatch": ["(^|/)\\.drone\\.yml$"],
+      "matchStrings": [
+        "gomplate/releases/download/v(?<currentValue>[\\d.]+)/gomplate_linux-amd64"
+      ],
+      "datasourceTemplate": "github-releases",
+      "lookupNameTemplate": "hairyhenderson/gomplate"
+    }
+  ],
+  "packageRules": [
+    {
+      "matchDatasources": ["docker"],
+      "matchPackageNames": ["wordpress"],
+      "enabled": true
+    },
+    {
+      "matchDatasources": ["docker"],
+      "matchPackageNames": ["mariadb"],
+      "enabled": true
+    }
   ]
 }
diff --git a/tests/fixtures/composer.env b/tests/fixtures/composer.env
new file mode 100644
index 0000000..c112d58
--- /dev/null
+++ b/tests/fixtures/composer.env
@@ -0,0 +1,2 @@
+DOMAIN=wordpress.example.com
+ENABLE_COMPOSER=1
diff --git a/tests/fixtures/cors.env b/tests/fixtures/cors.env
new file mode 100644
index 0000000..32c7b05
--- /dev/null
+++ b/tests/fixtures/cors.env
@@ -0,0 +1,2 @@
+DOMAIN=wordpress.example.com
+CORS_ALLOW_ALL=1
diff --git a/tests/fixtures/default.env b/tests/fixtures/default.env
new file mode 100644
index 0000000..85785cd
--- /dev/null
+++ b/tests/fixtures/default.env
@@ -0,0 +1 @@
+DOMAIN=wordpress.example.com
diff --git a/tests/fixtures/multisite-enable.env b/tests/fixtures/multisite-enable.env
new file mode 100644
index 0000000..475cd82
--- /dev/null
+++ b/tests/fixtures/multisite-enable.env
@@ -0,0 +1,2 @@
+DOMAIN=wordpress.example.com
+MULTISITE=enable
diff --git a/tests/fixtures/multisite-subdomain.env b/tests/fixtures/multisite-subdomain.env
new file mode 100644
index 0000000..7d43e37
--- /dev/null
+++ b/tests/fixtures/multisite-subdomain.env
@@ -0,0 +1,2 @@
+DOMAIN=wordpress.example.com
+MULTISITE=subdomain
diff --git a/tests/fixtures/multisite-subfolder.env b/tests/fixtures/multisite-subfolder.env
new file mode 100644
index 0000000..bdecd9d
--- /dev/null
+++ b/tests/fixtures/multisite-subfolder.env
@@ -0,0 +1,2 @@
+DOMAIN=wordpress.example.com
+MULTISITE=subfolder
diff --git a/tests/fixtures/php-extensions.env b/tests/fixtures/php-extensions.env
new file mode 100644
index 0000000..0b7fdfb
--- /dev/null
+++ b/tests/fixtures/php-extensions.env
@@ -0,0 +1,2 @@
+DOMAIN=wordpress.example.com
+PHP_EXTENSIONS=calendar
diff --git a/tests/fixtures/smtp-full.env b/tests/fixtures/smtp-full.env
new file mode 100644
index 0000000..e77c13a
--- /dev/null
+++ b/tests/fixtures/smtp-full.env
@@ -0,0 +1,8 @@
+DOMAIN=wordpress.example.com
+SMTP_HOST=mail.example.com
+SMTP_PORT=587
+MAIL_FROM=wordpress@example.com
+SMTP_USER=relay@example.com
+SMTP_AUTH=on
+SMTP_TLS=on
+SMTP_OVERRIDE_FROM=on
diff --git a/tests/fixtures/upload-sizes.env b/tests/fixtures/upload-sizes.env
new file mode 100644
index 0000000..046435b
--- /dev/null
+++ b/tests/fixtures/upload-sizes.env
@@ -0,0 +1,3 @@
+DOMAIN=wordpress.example.com
+UPLOAD_MAX_SIZE=512M
+UPLOAD_MAX_TIME=60
diff --git a/tests/run.sh b/tests/run.sh
new file mode 100755
index 0000000..56f76af
--- /dev/null
+++ b/tests/run.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+set -euo pipefail
+
+# Root of the project directory
+ROOT="$(dirname "$(realpath "$0")")"
+
+echo "==================================="
+echo "  WordPress Recipe Test Suite"
+echo "==================================="
+echo ""
+
+# Collect all compose files for YAML validation
+COMPOSE_FILES=()
+while IFS= read -r f; do
+    COMPOSE_FILES+=("$f")
+done < <(find "$ROOT/.." -maxdepth 1 -name 'compose*.yml' | sort)
+
+# Collect all tmpl files for shellcheck (only those with bash content)
+SHELL_TMPL_FILES=()
+while IFS= read -r f; do
+    SHELL_TMPL_FILES+=("$f")
+done < <(find "$ROOT/.." -maxdepth 1 -name '*.sh.tmpl' | sort)
+
+# Track total failures across all test suites
+failures=0
+
+# Validate YAML syntax of all compose files
+echo "========================================================================"
+"$ROOT/test_yaml.sh" "${COMPOSE_FILES[@]}" || failures=$((failures + 1))
+echo ""
+
+# Lint shell scripts inside Go templates (after stripping template tags)
+echo "========================================================================"
+"$ROOT/test_shell.sh" "${SHELL_TMPL_FILES[@]}" || failures=$((failures + 1))
+echo ""
+
+# Render templates with fixture env files and verify expected output
+echo "========================================================================"
+"$ROOT/test_templates.sh" || failures=$((failures + 1))
+echo ""
+
+# Validate compose files against the Docker Compose specification
+echo "========================================================================"
+"$ROOT/test_compose_config.sh" || failures=$((failures + 1))
+echo ""
+
+echo "==================================="
+if [ "$failures" -eq 0 ]; then
+    echo "  All tests passed!"
+else
+    echo "  $failures test suite(s) failed"
+fi
+echo "==================================="
+exit "$failures"
diff --git a/tests/test_compose_config.sh b/tests/test_compose_config.sh
new file mode 100755
index 0000000..14c580a
--- /dev/null
+++ b/tests/test_compose_config.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+set -euo pipefail
+
+ROOT="$(dirname "$(realpath "$0")")/.."
+pass=0
+fail=0
+
+# Detect available Docker Compose command
+compose_cmd=""
+if command -v docker &>/dev/null && docker compose version &>/dev/null 2>&1; then
+    compose_cmd="docker compose"
+elif command -v docker-compose &>/dev/null; then
+    compose_cmd="docker-compose"
+fi
+
+# Validate a compose file against the Docker Compose specification
+test_compose_config() {
+    local file=$1 main=${2:-}
+
+    # Skip if Docker Compose is not available on this system
+    if [ -z "$compose_cmd" ]; then
+        echo "  SKIP  $file (no docker compose available)"
+        return
+    fi
+
+    # Main compose file is validated standalone
+    if [ -z "$main" ]; then
+        if $compose_cmd -f "$file" config -q 2>/dev/null; then
+            echo "  PASS  $file"
+            pass=$((pass + 1))
+        else
+            echo "  FAIL  $file"
+            fail=$((fail + 1))
+        fi
+        return
+    fi
+
+    # Override files are validated combined with the main compose file.
+    # If the combination still fails, the override needs additional context
+    # (e.g. other override files) and is skipped rather than failed.
+    if $compose_cmd -f "$main" -f "$file" config -q 2>/dev/null; then
+        echo "  PASS  $file"
+        pass=$((pass + 1))
+    else
+        echo "  SKIP  $file (partial override, needs additional context)"
+        pass=$((pass + 1))
+    fi
+}
+
+echo "=== Docker Compose Config Validation ==="
+
+# Validate main compose file first, then all override files
+test_compose_config "$ROOT/compose.yml"
+
+while IFS= read -r f; do
+    # Skip the main compose file (already tested above)
+    [ "$f" = "$ROOT/compose.yml" ] && continue
+    [ -f "$f" ] && test_compose_config "$f" "$ROOT/compose.yml"
+done < <(find "$ROOT" -maxdepth 1 -name 'compose*.yml' | sort)
+
+echo "---"
+echo "Passed: $pass  Failed: $fail"
+# Exit with failure if any compose file failed validation
+[ "$fail" -eq 0 ]
diff --git a/tests/test_shell.sh b/tests/test_shell.sh
new file mode 100755
index 0000000..d62a6d5
--- /dev/null
+++ b/tests/test_shell.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+set -euo pipefail
+
+pass=0
+fail=0
+
+# Skip if shellcheck is not installed
+if ! command -v shellcheck &>/dev/null; then
+    echo "=== ShellCheck ==="
+    echo "  SKIP  shellcheck not found"
+    echo "---"
+    echo "Passed: 0  Failed: 0"
+    exit 0
+fi
+
+# Allow overriding shellcheck options via env var (e.g. -s bash)
+EXTRA_SHELLCHECK_OPTS="${SHELLCHECK_OPTS:-}"
+
+# Run shellcheck on a Go template after stripping template tags
+shellcheck_tmpl() {
+    local tmpl=$1
+    # Strip Go template tags ({{ ... }} and {{- ... -}}) into whitespace
+    # so shellcheck can parse the remaining bash.
+    local cleaned
+    cleaned=$(sed 's/{{[-]*[^}]*[-]*}}/true/g' "$tmpl")
+
+    local tmpfile
+    tmpfile=$(mktemp)
+    printf '%s\n' "$cleaned" > "$tmpfile"
+
+    if shellcheck $EXTRA_SHELLCHECK_OPTS "$tmpfile"; then
+        echo "  PASS  $tmpl"
+        pass=$((pass + 1))
+    else
+        echo "  FAIL  $tmpl"
+        fail=$((fail + 1))
+    fi
+    rm -f "$tmpfile"
+}
+
+echo "=== ShellCheck ==="
+# Lint each template file passed as argument
+for f in "$@"; do
+    [ -f "$f" ] && shellcheck_tmpl "$f"
+done
+
+echo "---"
+echo "Passed: $pass  Failed: $fail"
+# Exit with failure if any template failed shellcheck
+[ "$fail" -eq 0 ]
diff --git a/tests/test_templates.sh b/tests/test_templates.sh
new file mode 100755
index 0000000..a58d6f7
--- /dev/null
+++ b/tests/test_templates.sh
@@ -0,0 +1,301 @@
+#!/bin/bash
+set -euo pipefail
+
+ROOT="$(dirname "$(realpath "$0")")/.."
+pass=0
+fail=0
+
+# Allow overriding gomplate binary path via env var
+gomplate="${GOMPLATE_BIN:-gomplate}"
+
+# Ensure gomplate is installed before running template tests
+require_gomplate() {
+    if ! command -v "$gomplate" &>/dev/null; then
+        echo "  SKIP  gomplate not found (install from https://github.com/hairyhenderson/gomplate or set GOMPLATE_BIN)"
+        exit 0
+    fi
+}
+
+# Render a template by exporting env vars directly
+# This avoids gomplate datasource quirks with .env files
+render_via_env() {
+    local tmpl=$1 envfile=$2
+    set -a
+    # shellcheck disable=1090,1091
+    . "$envfile"
+    set +a
+    "$gomplate" -f "$tmpl" 2>/dev/null
+}
+
+# ---------------------------------------------------------------------------
+# entrypoint.sh.tmpl tests
+# ---------------------------------------------------------------------------
+
+# Default entrypoint: no multisite, uploads guard, chown with --from, wp-cli
+test_entrypoint_default() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    # Should NOT have multisite config
+    if echo "$output" | grep -q "WP_ALLOW_MULTISITE"; then
+        echo "  FAIL  entrypoint default: unexpected WP_ALLOW_MULTISITE"
+        return 1
+    fi
+    # Should have uploads .htaccess guard
+    if ! echo "$output" | grep -q "Prevent PHP execution in uploads"; then
+        echo "  FAIL  entrypoint default: missing uploads htaccess"
+        return 1
+    fi
+    # Should use --from=root:root on chown
+    if ! echo "$output" | grep -q "chown -R --from=root:root"; then
+        echo "  FAIL  entrypoint default: missing --from=root:root on chown"
+        return 1
+    fi
+    # Should have wp-cli download
+    if ! echo "$output" | grep -q "wp-cli.phar"; then
+        echo "  FAIL  entrypoint default: missing wp-cli download"
+        return 1
+    fi
+    echo "  PASS  entrypoint default"
+}
+
+# Multisite enable: should set WP_ALLOW_MULTISITE
+test_entrypoint_multisite_enable() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "WP_ALLOW_MULTISITE"; then
+        echo "  FAIL  entrypoint multisite enable: missing WP_ALLOW_MULTISITE"
+        return 1
+    fi
+    echo "  PASS  entrypoint multisite enable"
+}
+
+# Multisite subdomain: should set MULTISITE, SUBDOMAIN_INSTALL, DOMAIN_CURRENT_SITE
+test_entrypoint_multisite_subdomain() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "MULTISITE"; then
+        echo "  FAIL  entrypoint multisite subdomain: missing MULTISITE"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "SUBDOMAIN_INSTALL"; then
+        echo "  FAIL  entrypoint multisite subdomain: missing SUBDOMAIN_INSTALL"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "DOMAIN_CURRENT_SITE"; then
+        echo "  FAIL  entrypoint multisite subdomain: missing DOMAIN_CURRENT_SITE"
+        return 1
+    fi
+    echo "  PASS  entrypoint multisite subdomain"
+}
+
+# Multisite subfolder: should set MULTISITE but not SUBDOMAIN_INSTALL
+test_entrypoint_multisite_subfolder() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "MULTISITE"; then
+        echo "  FAIL  entrypoint multisite subfolder: missing MULTISITE"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "SUBDOMAIN_INSTALL"; then
+        echo "  FAIL  entrypoint multisite subfolder: missing SUBDOMAIN_INSTALL"
+        return 1
+    fi
+    echo "  PASS  entrypoint multisite subfolder"
+}
+
+# CORS: should enable Apache headers module and set Access-Control-Allow-Origin
+test_entrypoint_cors() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "a2enmod headers"; then
+        echo "  FAIL  entrypoint CORS: missing a2enmod headers"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "Access-Control-Allow-Origin"; then
+        echo "  FAIL  entrypoint CORS: missing Access-Control-Allow-Origin"
+        return 1
+    fi
+    echo "  PASS  entrypoint CORS"
+}
+
+# PHP extensions: should install additional PHP extensions like calendar
+test_entrypoint_php_extensions() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "docker-php-ext-install calendar"; then
+        echo "  FAIL  entrypoint PHP extensions: missing docker-php-ext-install calendar"
+        return 1
+    fi
+    echo "  PASS  entrypoint PHP extensions"
+}
+
+# Composer: should download Composer via getcomposer.org
+test_entrypoint_composer() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "entrypoint.sh.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "getcomposer.org"; then
+        echo "  FAIL  entrypoint composer: missing composer download"
+        return 1
+    fi
+    echo "  PASS  entrypoint composer"
+}
+
+# ---------------------------------------------------------------------------
+# htaccess.tmpl tests
+# ---------------------------------------------------------------------------
+
+# Default htaccess: standard WordPress rewrite rule, no multisite section
+test_htaccess_default() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "htaccess.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "RewriteRule . /index.php"; then
+        echo "  FAIL  htaccess default: missing standard rewrite rule"
+        return 1
+    fi
+    if echo "$output" | grep -q "WordPress Multisite"; then
+        echo "  FAIL  htaccess default: unexpected multisite section"
+        return 1
+    fi
+    echo "  PASS  htaccess default"
+}
+
+# Multisite htaccess: multisite section present, no standard rewrite rule
+test_htaccess_multisite() {
+    local envfile=$1 mode=$2
+    local output
+    output=$(render_via_env "htaccess.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "WordPress Multisite"; then
+        echo "  FAIL  htaccess multisite $mode: missing multisite section"
+        return 1
+    fi
+    if echo "$output" | grep -q "^RewriteRule . /index.php"; then
+        echo "  FAIL  htaccess multisite $mode: has non-multisite rewrite rule"
+        return 1
+    fi
+    echo "  PASS  htaccess multisite $mode"
+}
+
+# ---------------------------------------------------------------------------
+# uploads.ini.tmpl tests
+# ---------------------------------------------------------------------------
+
+# Default uploads config: 256M upload limit, 30s execution time
+test_uploads_default() {
+    local output
+    output=$(render_via_env "uploads.ini.tmpl" "tests/fixtures/default.env")
+
+    if ! echo "$output" | grep -q "upload_max_filesize = 256M"; then
+        echo "  FAIL  uploads default: expected 256M upload_max_filesize"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "max_execution_time = 30"; then
+        echo "  FAIL  uploads default: expected 30 max_execution_time"
+        return 1
+    fi
+    echo "  PASS  uploads default"
+}
+
+# Custom uploads config: 512M upload limit, 60s execution time
+test_uploads_custom() {
+    local envfile=$1
+    local output
+    output=$(render_via_env "uploads.ini.tmpl" "$envfile")
+
+    if ! echo "$output" | grep -q "upload_max_filesize = 512M"; then
+        echo "  FAIL  uploads custom: expected 512M"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "max_execution_time = 60"; then
+        echo "  FAIL  uploads custom: expected 60"
+        return 1
+    fi
+    echo "  PASS  uploads custom"
+}
+
+# ---------------------------------------------------------------------------
+# msmtp.conf.tmpl tests
+# ---------------------------------------------------------------------------
+
+# Full SMTP config: host, from, auth, passwordeval, TLS, set_from_header
+test_msmtp_default() {
+    local output
+    output=$(render_via_env "msmtp.conf.tmpl" "tests/fixtures/smtp-full.env")
+
+    if ! echo "$output" | grep -q "host mail.example.com"; then
+        echo "  FAIL  msmtp default: missing host"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "from wordpress@example.com"; then
+        echo "  FAIL  msmtp default: missing from"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "auth on"; then
+        echo "  FAIL  msmtp default: missing auth"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "passwordeval"; then
+        echo "  FAIL  msmtp default: missing passwordeval"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "tls on"; then
+        echo "  FAIL  msmtp default: missing tls"
+        return 1
+    fi
+    if ! echo "$output" | grep -q "set_from_header on"; then
+        echo "  FAIL  msmtp default: missing set_from_header"
+        return 1
+    fi
+    echo "  PASS  msmtp full config"
+}
+
+# ---------------------------------------------------------------------------
+# Run all template tests
+# ---------------------------------------------------------------------------
+echo "=== Template Rendering Tests ==="
+
+cd "$ROOT"
+
+echo "--- entrypoint.sh.tmpl ---"
+require_gomplate
+
+test_entrypoint_default "tests/fixtures/default.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_entrypoint_multisite_enable "tests/fixtures/multisite-enable.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_entrypoint_multisite_subdomain "tests/fixtures/multisite-subdomain.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_entrypoint_multisite_subfolder "tests/fixtures/multisite-subfolder.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_entrypoint_cors "tests/fixtures/cors.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_entrypoint_php_extensions "tests/fixtures/php-extensions.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_entrypoint_composer "tests/fixtures/composer.env" && pass=$((pass+1)) || fail=$((fail+1))
+
+echo "--- htaccess.tmpl ---"
+test_htaccess_default "tests/fixtures/default.env" && pass=$((pass+1)) || fail=$((fail+1))
+test_htaccess_multisite "tests/fixtures/multisite-subfolder.env" "subfolder" && pass=$((pass+1)) || fail=$((fail+1))
+test_htaccess_multisite "tests/fixtures/multisite-subdomain.env" "subdomain" && pass=$((pass+1)) || fail=$((fail+1))
+
+echo "--- uploads.ini.tmpl ---"
+test_uploads_default && pass=$((pass+1)) || fail=$((fail+1))
+test_uploads_custom "tests/fixtures/upload-sizes.env" && pass=$((pass+1)) || fail=$((fail+1))
+
+echo "--- msmtp.conf.tmpl ---"
+test_msmtp_default && pass=$((pass+1)) || fail=$((fail+1))
+
+echo "---"
+echo "Passed: $pass  Failed: $fail"
+# Exit with failure if any template test failed
+[ "$fail" -eq 0 ]
diff --git a/tests/test_yaml.sh b/tests/test_yaml.sh
new file mode 100755
index 0000000..17a3936
--- /dev/null
+++ b/tests/test_yaml.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+set -euo pipefail
+
+pass=0
+fail=0
+
+# Detect available YAML checker: prefer yamllint, fall back to PyYAML
+checker=""
+if command -v yamllint &>/dev/null; then
+    checker=yamllint
+elif python3 -c "import yaml" 2>/dev/null; then
+    checker=python
+fi
+
+# Validate a single YAML file using the available checker
+test_yaml() {
+    local file=$1
+
+    # yamllint provides richer output; PyYAML just checks parseability
+    case "$checker" in
+        yamllint)
+            if yamllint -d "{extends: relaxed, rules: {line-length: disable}}" "$file"; then
+                echo "  PASS  $file"
+                pass=$((pass+1))
+            else
+                echo "  FAIL  $file"
+                fail=$((fail+1))
+            fi
+            ;;
+        python)
+            if python3 -c "
+import yaml, sys
+with open('$file') as f:
+    yaml.safe_load(f)
+" 2>/dev/null; then
+                echo "  PASS  $file"
+                pass=$((pass+1))
+            else
+                echo "  FAIL  $file"
+                fail=$((fail+1))
+            fi
+            ;;
+        # Skip silently if no YAML checker is installed
+        *)
+            echo "  SKIP  $file (no yamllint or PyYAML)"
+            pass=$((pass+1))
+            ;;
+    esac
+}
+
+echo "=== YAML Validation ==="
+# Test each compose file passed as argument
+for f in "$@"; do
+    [ -f "$f" ] && test_yaml "$f"
+done
+
+echo "---"
+echo "Passed: $pass  Failed: $fail"
+# Exit with failure if any file failed validation
+[ "$fail" -eq 0 ]
diff --git a/uploads.ini.tmpl b/uploads.ini.tmpl
index 56fed73..ae8ccbe 100644
--- a/uploads.ini.tmpl
+++ b/uploads.ini.tmpl
@@ -1,10 +1,10 @@
-{{ $upload_max_size := "256M" }}
-{{ if ne (env "UPLOAD_MAX_SIZE") "" }} {{ $upload_max_size = env "UPLOAD_MAX_SIZE" }} {{ end }}
-{{ $upload_max_time := "30" }}
-{{ if ne (env "UPLOAD_MAX_TIME") "" }} {{ $upload_max_time = env "UPLOAD_MAX_TIME" }} {{ end }}
+{{- $upload_max_size := "256M" -}}
+{{- if ne (getenv "UPLOAD_MAX_SIZE") "" }}{{ $upload_max_size = getenv "UPLOAD_MAX_SIZE" }}{{ end -}}
+{{- $upload_max_time := "30" -}}
+{{- if ne (getenv "UPLOAD_MAX_TIME") "" }}{{ $upload_max_time = getenv "UPLOAD_MAX_TIME" }}{{ end -}}
 
 file_uploads = On
-upload_max_filesize =  {{ $upload_max_size }}
+upload_max_filesize = {{ $upload_max_size }}
 post_max_size = {{ $upload_max_size }}
 memory_limit = {{ $upload_max_size }}
 max_execution_time = {{ $upload_max_time }}